valeriy42 · Oct 16, 2026 · Oct 16, 2026 · Oct 16, 2026 · Oct 16, 2026 · Oct 16, 2026
diff --git a/3rd_party/3rd_party.cmake b/3rd_party/3rd_party.cmake
@@ -57,7 +57,6 @@ if ("${HOST_SYSTEM_NAME}" STREQUAL "darwin")
   endif()
   set(BOOST_EXTENSION "mt-${BOOST_ARCH}-1_86.dylib")
   set(BOOST_LIBRARIES "atomic" "chrono" "date_time" "filesystem" "iostreams" "log" "log_setup" "program_options" "regex" "system" "thread" "unit_test_framework")
-  set(XML_LOCATION)
   set(GCC_RT_LOCATION)
   set(STL_LOCATION)
   set(OMP_LOCATION)
@@ -81,8 +80,6 @@ elseif ("${HOST_SYSTEM_NAME}" STREQUAL "linux")
     endif()
     set(BOOST_EXTENSION mt-${BOOST_ARCH}-1_86.so.1.86.0)
     set(BOOST_LIBRARIES "atomic" "chrono" "date_time" "filesystem" "iostreams" "log" "log_setup" "program_options" "regex" "system" "thread" "unit_test_framework")
-    set(XML_LOCATION "/usr/local/gcc133/lib")
-    set(XML_EXTENSION ".so.2")
     set(GCC_RT_LOCATION "/usr/local/gcc133/lib64")
     set(GCC_RT_EXTENSION ".so.1")
     set(STL_LOCATION "/usr/local/gcc133/lib64")
@@ -102,7 +99,6 @@ elseif ("${HOST_SYSTEM_NAME}" STREQUAL "linux")
     set(BOOST_COMPILER "clang-darwin${CMAKE_CXX_COMPILER_VERSION_MAJOR}")
     set(BOOST_EXTENSION "mt-x64-1_86.dylib")
     set(BOOST_LIBRARIES "atomic" "chrono" "date_time" "filesystem" "iostreams" "log" "log_setup" "program_options" "regex" "system" "thread" "unit_test_framework")
-    set(XML_LOCATION)
     set(GCC_RT_LOCATION)
     set(STL_LOCATION)
     set(OMP_LOCATION)
@@ -123,8 +119,6 @@ else()
   set(BOOST_COMPILER "vc")
   set(BOOST_EXTENSION "mt-x64-1_86.dll")
   set(BOOST_LIBRARIES "atomic" "chrono" "date_time" "filesystem" "iostreams" "log" "log_setup" "program_options" "regex" "system" "thread" "unit_test_framework")
-  set(XML_LOCATION "${LOCAL_DRIVE}/usr/local/bin")
-  set(XML_EXTENSION ".dll")
   set(GCC_RT_LOCATION)
   # Read VCBASE from environment if defined, otherwise default to VS Professional 2019
   message(STATUS "3rd_party: \$ENV{VCBASE} $ENV{VCBASE}")
@@ -231,7 +225,6 @@ endfunction()
 file(MAKE_DIRECTORY "${INSTALL_DIR}")
 
 install_libs("Boost" ${BOOST_LOCATION} "boost*" "${BOOST_COMPILER}*${BOOST_EXTENSION}" ${BOOST_LIBRARIES})
-install_libs("libxml2" ${XML_LOCATION} "" "${XML_EXTENSION}" "libxml2")
 install_libs("gcc runtime library" ${GCC_RT_LOCATION} "" "${GCC_RT_EXTENSION}" "libgcc_s")
 install_libs("C++ standard library" ${STL_LOCATION} "" "${STL_EXTENSION}" "${STL_PATTERN}")
 install_libs("OMP runtime library" ${OMP_LOCATION} "" "${OMP_EXTENSION}" "${OMP_PATTERN}")

diff --git a/3rd_party/licenses/libxml2-INFO.csv b/3rd_party/licenses/libxml2-INFO.csv
diff --git a/3rd_party/licenses/libxml2-LICENSE.txt b/3rd_party/licenses/libxml2-LICENSE.txt
diff --git a/3rd_party/licenses/libxml2-NOTICE.txt b/3rd_party/licenses/libxml2-NOTICE.txt
diff --git a/AGENTS.md b/AGENTS.md
@@ -4,7 +4,7 @@
 - **Language**: C++20 (`CMAKE_CXX_STANDARD 20`).
 - **Build system**: CMake (primary) or Gradle wrapper (`./gradlew`).
 - **Compilers**: GCC 13.3.0 on Linux (built from source, installed to `/usr/local/gcc133/`), Xcode Clang on macOS (Xcode 15.2+ for Ventura/Sonoma), Visual Studio 2022 Professional (MSVC) on Windows.
-- **Key dependencies**: Boost 1.86.0 (dynamic linking, includes Boost.Json for JSON handling), PyTorch 2.7.1 (libtorch), libxml2.
+- **Key dependencies**: Boost 1.86.0 (dynamic linking, includes Boost.Json for JSON handling), PyTorch 2.7.1 (libtorch).
 - **Header-only libraries**: Eigen and valijson are header-only and managed by the `3rd_party/` CMake system (pulled automatically during configuration).
 - **Platforms**: Linux x86_64/aarch64, macOS aarch64, Windows x86_64.
 - **Toolchain files**: Auto-selected from `cmake/<os>-<arch>.cmake` or set via `CMAKE_TOOLCHAIN_FILE`.

diff --git a/bin/controller/unittest/CMakeLists.txt b/bin/controller/unittest/CMakeLists.txt
@@ -21,7 +21,6 @@ set (SRCS
 
 set(ML_LINK_LIBRARIES
   ${Boost_LIBRARIES_WITH_UNIT_TEST}
-  ${LIBXML2_LIBRARIES}
   MlCore
   MlProcessSpawnerRouter
   MlSandbox

diff --git a/bin/pytorch_inference/unittest/CMakeLists.txt b/bin/pytorch_inference/unittest/CMakeLists.txt
@@ -21,7 +21,6 @@ set (SRCS
 
 set(ML_LINK_LIBRARIES
   ${Boost_LIBRARIES_WITH_UNIT_TEST}
-  ${LIBXML2_LIBRARIES}
   MlCore
   MlMathsCommon
   MlMathsAnalytics

diff --git a/build-setup/linux.md b/build-setup/linux.md
@@ -156,25 +156,6 @@ sudo make prefix=/usr install
 
 Without the `prefix=/usr` bit, you'll end up with a personal Git build in `~/bin` instead of one everyone on the machine can use.
 
-### libxml2
-
-Download `libxml2-2.10.4.tar.xz` from <https://download.gnome.org/sources/libxml2/2.10/libxml2-2.10.4.tar.xz>.
-
-Uncompress and untar the resulting file. Then run:
-
-```
-./configure --prefix=/usr/local/gcc133 --without-python --without-readline
-```
-
-This should build an appropriate Makefile. Assuming it does, type:
-
-```
-make
-sudo make install
-```
-
-to install.
-
 ### Boost 1.86.0
 
 Download version 1.86.0 of Boost from <https://archives.boost.io/release/1.86.0/source/boost_1_86_0.tar.bz2>. You must get this exact version, as the Machine Learning build system requires it.

diff --git a/build-setup/windows.md b/build-setup/windows.md
@@ -95,40 +95,6 @@ nmake -f win32/Makefile.msc test
 
 All the build output will end up in the top level `C:\tools\zlib-1.3.1` directory. Once the build is complete, copy `zlib1.dll` and `minigzip.exe` to `C:\usr\local\bin`. Copy `zlib.lib` and `zdll.lib` to `C:\usr\local\lib`. And copy `zlib.h` and `zconf.h` to `C:\usr\local\include`.
 
-### libxml2
-
-Download `libxml2-2.9.14.tar.xz` from <https://download.gnome.org/sources/libxml2/2.9/libxml2-2.9.14.tar.xz>.
-
-Extract it in a Git bash shell using the GNU tar that comes with Git for Windows, e.g.:
-
-```
-cd /c/tools
-tar Jxvf /z/cpp_src/libxml2-2.9.14.tar.xz
-```
-
-Edit `C:\tools\libxml2-2.9.14\win32\Makefile.msvc` and change the following lines:
-
-```
-CFLAGS = $(CFLAGS) /D "NDEBUG" /O2
-```
-
-to:
-
-```
-CFLAGS = $(CFLAGS) /D "NDEBUG" /O2 /Zi /D_WIN32_WINNT=0x0601
-```
-
-(because we might as well generate a PDB file and we want to limit Windows API functions to those that exist in Windows Server 2008r2).
-
-Start a command prompt using Start Menu -&gt; Apps -&gt; Visual Studio 2022 -&gt; x64 Native Tools Command Prompt for VS 2022, then in it type:
-
-```
-cd \tools\libxml2-2.9.14\win32
-cscript configure.js iconv=no prefix=C:\usr\local
-nmake
-nmake install
-```
-
 ### Boost 1.86.0
 
 Download version 1.86.0 of Boost from <https://archives.boost.io/release/1.86.0/source/boost_1_86_0.tar.bz2> . You must get this exact version, as the Machine Learning build system requires it.

diff --git a/cmake/variables.cmake b/cmake/variables.cmake
@@ -107,12 +107,6 @@ else()
   set(C10_LIB   "${ML_BASE_PATH}/lib/libc10${ML_LIBEXT}")
 endif()
 
-if (CMAKE_SYSTEM_NAME STREQUAL "Darwin")
-  set(LIBXML2_LIBRARIES "-lxml2")
-else()
-  set(LIBXML2_LIBRARIES "${ML_BASE_PATH}/lib/libxml2${ML_LIBEXT}")
-endif()
-
 if (CMAKE_SYSTEM_NAME STREQUAL "Windows")
   set(ZLIB_LIBRARIES "${ML_BASE_PATH}/lib/zlib${ML_LIBEXT}")
 else()
@@ -128,9 +122,7 @@ if (CMAKE_SYSTEM_NAME STREQUAL "Darwin")
   if (CMAKE_CROSSCOMPILING)
     list(APPEND ML_SYSTEM_INCLUDE_DIRECTORIES ${SYSROOT}/usr/include/c++/v1)
   endif()
-  list(APPEND ML_SYSTEM_INCLUDE_DIRECTORIES ${SYSROOT}/usr/include ${SYSROOT}/usr/include/libxml2 ${SYSROOT}/usr/local/include)
-else ()
-  list(APPEND ML_SYSTEM_INCLUDE_DIRECTORIES ${ML_BASE_PATH}/include/libxml2)
+  list(APPEND ML_SYSTEM_INCLUDE_DIRECTORIES ${SYSROOT}/usr/include ${SYSROOT}/usr/local/include)
 endif()
 
 list(APPEND ML_SYSTEM_INCLUDE_DIRECTORIES

diff --git a/dev-tools/build_windows_third_party_deps.ps1 b/dev-tools/build_windows_third_party_deps.ps1
@@ -49,21 +49,6 @@ Copy-Item .\zlib.h  -Destination C:\usr\local\include\
 Copy-Item .\zconf.h  -Destination C:\usr\local\include\
 Write-Host "--- Done Installing zlib 1.3.1"
 
-# Build and install libxml2 2.9.14
-Write-Host "--- Installing libxml2 2.9.14"
-cd c:\tools
-$Archive="libxml2-2.9.14.tar.xz"
-$ZipSource="https://download.gnome.org/sources/libxml2/2.9/$Archive"
-$ZipDestination="\tools\$Archive"
-(New-Object Net.WebClient).DownloadFile($ZipSource, $ZipDestination)
-C:\Progra~1\git\bin\bash.exe -c "tar Jxvf libxml2-2.9.14.tar.xz"
-cd \tools\libxml2-2.9.14\win32
-(Get-Content .\Makefile.msvc) -replace """NDEBUG"" /O2" , """NDEBUG"" /O2 /Zi /D_WIN32_WINNT=0x0601" | Set-Content .\Makefile.msvc
-cscript configure.js iconv=no prefix=C:\usr\local
-nmake
-nmake install
-Write-Host "--- Done Installing libxml2 2.9.14"
-
 # Build and install Boost 1.86.0
 Write-Host "--- Installing boost 1.86.0"
 cd c:\tools

diff --git a/dev-tools/docker/linux_aarch64_native_image/Dockerfile b/dev-tools/docker/linux_aarch64_native_image/Dockerfile
@@ -65,17 +65,6 @@ RUN \
   cd .. && \
   rm -rf binutils-2.41 /tmp/*
 
-# Build libxml2
-RUN \
-  cd ${build_dir} && \
-  wget --quiet -O - https://download.gnome.org/sources/libxml2/2.10/libxml2-2.10.4.tar.xz | tar Jxf - && \
-  cd libxml2-2.10.4 && \
-  ./configure --prefix=/usr/local/gcc133 --without-python --without-readline --without-lzma --without-zstd  && \
-  make -j$(nproc) && \
-  make install && \
-  cd .. && \
-  rm -rf libxml2-2.10.4 /tmp/*
-
 RUN \
   for i in $(ls /lib64/libzstd.*); do mv $i "$i.bak" ; done && \
   for i in $(ls /lib64/liblzma.*); do mv $i "$i.bak" ; done

diff --git a/dev-tools/docker/linux_image/Dockerfile b/dev-tools/docker/linux_image/Dockerfile
@@ -65,17 +65,6 @@ RUN \
   cd .. && \
   rm -rf binutils-2.41 /tmp/*
 
-# Build libxml2
-RUN \
-  cd ${build_dir} && \
-  wget --quiet -O - https://download.gnome.org/sources/libxml2/2.10/libxml2-2.10.4.tar.xz | tar Jxf - && \
-  cd libxml2-2.10.4 && \
-  ./configure --prefix=/usr/local/gcc133 --without-python --without-readline --without-lzma --without-zstd  && \
-  make -j$(nproc) && \
-  make install && \
-  cd .. && \
-  rm -rf libxml2-2.10.4 /tmp/*
-
 RUN \
   for i in $(ls /lib64/libzstd.*); do mv $i "$i.bak" ; done && \
   for i in $(ls /lib64/liblzma.*); do mv $i "$i.bak" ; done

diff --git a/dev-tools/docker/ubuntu_devbox/Dockerfile b/dev-tools/docker/ubuntu_devbox/Dockerfile
@@ -69,17 +69,6 @@ RUN \
   cd .. && \
   rm -rf binutils-2.41
 
-# Build libxml2
-RUN \
-  cd ${build_dir} && \
-  wget --quiet --no-check-certificate -O - https://download.gnome.org/sources/libxml2/2.10/libxml2-2.10.4.tar.xz | tar Jxf - && \
-  cd libxml2-2.10.4 && \
-  ./configure --prefix=/usr/local/gcc133 --without-python --without-readline && \
-  make -j`nproc` && \
-  make install && \
-  cd .. && \
-  rm -rf libxml2-2.10.4
-
 # Build Boost
 RUN \
   cd ${build_dir} && \

diff --git a/dev-tools/docker/ubuntu_devbox/Dockerfile.8.11 b/dev-tools/docker/ubuntu_devbox/Dockerfile.8.11
@@ -62,17 +62,6 @@ RUN \
   cd .. && \
   rm -rf binutils-2.37
 
-# Build libxml2
-RUN \
-  cd ${build_dir} && \
-  wget --quiet --no-check-certificate -O - https://download.gnome.org/sources/libxml2/2.9/libxml2-2.9.14.tar.xz | tar Jxf - && \
-  cd libxml2-2.9.14 && \
-  ./configure --prefix=/usr/local/gcc103 --without-python --without-readline && \
-  make -j`nproc` && \
-  make install && \
-  cd .. && \
-  rm -rf libxml2-2.9.14
-
 # Build Boost
 RUN \
   cd ${build_dir} && \

diff --git a/dev-tools/docker/ubuntu_devbox/Dockerfile.8.16 b/dev-tools/docker/ubuntu_devbox/Dockerfile.8.16
@@ -62,17 +62,6 @@ RUN \
   cd .. && \
   rm -rf binutils-2.37
 
-# Build libxml2
-RUN \
-  cd ${build_dir} && \
-  wget --quiet --no-check-certificate -O - https://download.gnome.org/sources/libxml2/2.9/libxml2-2.9.14.tar.xz | tar Jxf - && \
-  cd libxml2-2.9.14 && \
-  ./configure --prefix=/usr/local/gcc103 --without-python --without-readline && \
-  make -j`nproc` && \
-  make install && \
-  cd .. && \
-  rm -rf libxml2-2.9.14
-
 # Build Boost
 RUN \
   cd ${build_dir} && \

diff --git a/lib/api/unittest/CMakeLists.txt b/lib/api/unittest/CMakeLists.txt
@@ -61,7 +61,6 @@ set (SRCS
 
 set(ML_LINK_LIBRARIES
   ${Boost_LIBRARIES_WITH_UNIT_TEST}
-  ${LIBXML2_LIBRARIES}
   MlCore
   MlMathsCommon
   MlMathsAnalytics

diff --git a/lib/core/CMakeLists.txt b/lib/core/CMakeLists.txt
@@ -13,9 +13,14 @@ project("ML Core")
 
 set(ML_LINK_LIBRARIES
   ${ZLIB_LIBRARIES}
-  ${LIBXML2_LIBRARIES}
   ${Boost_LIBRARIES})
 
+if (CMAKE_SYSTEM_NAME STREQUAL "Linux")
+  # CCrashHandler_Linux.cc calls dladdr(), which lives in libdl on the glibc
+  # versions we build against. This used to be satisfied transitively by libxml2.
+  list(APPEND ML_LINK_LIBRARIES ${CMAKE_DL_LIBS})
+endif()
+
 ml_add_library(MlCore SHARED
   CBase64Filter.cc
   CBlockingCallCancellerThread.cc

diff --git a/lib/core/unittest/CMakeLists.txt b/lib/core/unittest/CMakeLists.txt
@@ -82,7 +82,6 @@ set (SRCS
 
 set(ML_LINK_LIBRARIES
   ${Boost_LIBRARIES_WITH_UNIT_TEST}
-  ${LIBXML2_LIBRARIES}
   MlCore
   MlMathsCommon
   MlTest

diff --git a/lib/maths/analytics/unittest/CMakeLists.txt b/lib/maths/analytics/unittest/CMakeLists.txt
@@ -28,7 +28,6 @@ set (SRCS
 
 set(ML_LINK_LIBRARIES
   ${Boost_LIBRARIES_WITH_UNIT_TEST}
-  ${LIBXML2_LIBRARIES}
   MlCore
   MlMathsCommon
   MlMathsAnalytics

diff --git a/lib/model/unittest/CMakeLists.txt b/lib/model/unittest/CMakeLists.txt
@@ -62,7 +62,6 @@ set (SRCS
 
 set(ML_LINK_LIBRARIES
   ${Boost_LIBRARIES_WITH_UNIT_TEST}
-  ${LIBXML2_LIBRARIES}
   MlCore
   MlMathsCommon
   MlMathsTimeSeries

diff --git a/lib/seccomp/unittest/CMakeLists.txt b/lib/seccomp/unittest/CMakeLists.txt
@@ -20,7 +20,6 @@ set (SRCS
 
 set(ML_LINK_LIBRARIES
   ${Boost_LIBRARIES_WITH_UNIT_TEST}
-  ${LIBXML2_LIBRARIES}
   MlCore
   MlSeccomp
   MlTest

diff --git a/lib/ver/unittest/CMakeLists.txt b/lib/ver/unittest/CMakeLists.txt
@@ -18,7 +18,6 @@ set (SRCS
 
 set(ML_LINK_LIBRARIES
   ${Boost_LIBRARIES_WITH_UNIT_TEST}
-  ${LIBXML2_LIBRARIES}
   MlCore
   MlVer
   MlTest
-Original file line number
+Diff line change
@@ Expand Up / @@ -18,7 +18,6 @@ set (SRCS @@
     set(ML_LINK_LIBRARIES
       ${Boost_LIBRARIES_WITH_UNIT_TEST}
-      ${LIBXML2_LIBRARIES}
       MlCore
       MlVer
       MlTest
@@ Expand Down @@